Headphone assembly



FIG. 1 is a perspective view of the headphone assembly from the side;

FIG. 2 shows a bottom side view of the headphone assembly;

FIG. 3 shows a top view of the headphone assembly;

FIG. 4 is a side elevational view thereof;

FIG. 5 is an opposite side elevational view thereof;

FIG. 6 is an end elevational view thereof; and,

FIG. 7 is an opposite end elevational view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a headphone assembly, as shown and described. 